Stabilization of silicon honeycomb chains by trivalent adsorbatesC. Battaglia, H. Cercellier, C. Monney, M. G. Garnier and P. Aebi
Institut de Physique, Université de Neuchâtel - CH-2000 Neuchâtel, Switzerland
received 2 October 2006; accepted in final form 29 November 2006; published February 2007
published online 5 February 2007
The atomic structure of self-assembled quasi-one-dimensional Gd chains on Si(111) has been investigated by low-energy electron diffraction and scanning tunneling microscopy. Based on comparison between Gd and Ca chains we show that this Gd-induced surface reconstruction belongs to the class of honeycomb chain-channel structures. This clearly demonstrates that, besides monovalent and divalent adsorbates, also trivalent adsorbates such as Gd stabilize silicon honeycomb chains. Consequently silicon honeycomb chains emerge as an universal building block in adsorbate-induced silicon surface reconstructions.
68.65.La - Quantum wires.
68.47.Fg - Semiconductor surfaces.
68.37.Ef - Scanning tunneling microscopy (including chemistry induced with STM).
© Europhysics Letters Association 2007